Fix: add missing rcu read side lock
[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.c
CommitLineData
54012638
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1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
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AM
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
54012638
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7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
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13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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16 */
17
18#define _GNU_SOURCE
19#include <stdio.h>
20#include <stdlib.h>
21#include <string.h>
c363b55d 22#include <unistd.h>
54012638 23
990570ed
DG
24#include <common/common.h>
25#include <common/defaults.h>
1e307fab 26
00e2e675 27#include "consumer.h"
62499ad6 28#include "trace-kernel.h"
54012638 29
19e70852 30/*
050349bb 31 * Find the channel name for the given kernel session.
19e70852 32 */
62499ad6 33struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
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34 char *name, struct ltt_kernel_session *session)
35{
36 struct ltt_kernel_channel *chan;
37
38 if (session == NULL) {
39 ERR("Undefine session");
40 goto error;
41 }
42
54d01ffb
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43 DBG("Trying to find channel %s", name);
44
19e70852
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45 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
46 if (strcmp(name, chan->channel->name) == 0) {
47 DBG("Found channel by name %s", name);
48 return chan;
49 }
50 }
51
52error:
53 return NULL;
54}
55
56/*
050349bb 57 * Find the event name for the given channel.
19e70852 58 */
62499ad6 59struct ltt_kernel_event *trace_kernel_get_event_by_name(
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60 char *name, struct ltt_kernel_channel *channel)
61{
62 struct ltt_kernel_event *ev;
63
64 if (channel == NULL) {
65 ERR("Undefine channel");
66 goto error;
67 }
68
69 cds_list_for_each_entry(ev, &channel->events_list.head, list) {
70 if (strcmp(name, ev->event->name) == 0) {
71 DBG("Found event by name %s for channel %s", name,
72 channel->channel->name);
73 return ev;
74 }
75 }
76
77error:
78 return NULL;
79}
80
54012638 81/*
050349bb 82 * Allocate and initialize a kernel session data structure.
54012638 83 *
050349bb 84 * Return pointer to structure or NULL.
54012638 85 */
f9815039 86struct ltt_kernel_session *trace_kernel_create_session(char *path)
54012638 87{
a4b92340 88 struct ltt_kernel_session *lks = NULL;
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89
90 /* Allocate a new ltt kernel session */
ba7f0ae5 91 lks = zmalloc(sizeof(struct ltt_kernel_session));
54012638 92 if (lks == NULL) {
df0f840b 93 PERROR("create kernel session zmalloc");
a4b92340 94 goto alloc_error;
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95 }
96
97 /* Init data structure */
03550b58
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98 lks->fd = -1;
99 lks->metadata_stream_fd = -1;
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100 lks->channel_count = 0;
101 lks->stream_count_global = 0;
102 lks->metadata = NULL;
103 CDS_INIT_LIST_HEAD(&lks->channel_list.head);
104
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105 lks->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
106 if (lks->consumer == NULL) {
107 goto error;
108 }
109
110 /*
111 * The tmp_consumer stays NULL until a set_consumer_uri command is
112 * executed. At this point, the consumer should be nullify until an
113 * enable_consumer command. This assignment is symbolic since we've zmalloc
114 * the struct.
115 */
116 lks->tmp_consumer = NULL;
117
a4b92340 118 if (path && strlen(path) > 0) {
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119 int ret;
120
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121 /* Use the default consumer output which is the tracing session path. */
122 ret = snprintf(lks->consumer->dst.trace_path, PATH_MAX,
123 "%s" DEFAULT_KERNEL_TRACE_DIR, path);
124 if (ret < 0) {
125 PERROR("snprintf consumer trace path");
126 goto error;
127 }
00e2e675 128
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129 /* Set session path */
130 ret = asprintf(&lks->trace_path, "%s" DEFAULT_KERNEL_TRACE_DIR, path);
131 if (ret < 0) {
132 PERROR("asprintf kernel traces path");
133 goto error;
134 }
f9815039
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135 }
136
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137 return lks;
138
139error:
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140 free(lks);
141
142alloc_error:
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143 return NULL;
144}
145
146/*
050349bb 147 * Allocate and initialize a kernel channel data structure.
54012638 148 *
050349bb 149 * Return pointer to structure or NULL.
54012638 150 */
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151struct ltt_kernel_channel *trace_kernel_create_channel(
152 struct lttng_channel *chan, char *path)
54012638 153{
54012638 154 struct ltt_kernel_channel *lkc;
54012638 155
ba7f0ae5 156 lkc = zmalloc(sizeof(struct ltt_kernel_channel));
f3ed775e 157 if (lkc == NULL) {
df0f840b 158 PERROR("ltt_kernel_channel zmalloc");
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159 goto error;
160 }
161
ba7f0ae5 162 lkc->channel = zmalloc(sizeof(struct lttng_channel));
f3ed775e 163 if (lkc->channel == NULL) {
df0f840b 164 PERROR("lttng_channel zmalloc");
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165 goto error;
166 }
167 memcpy(lkc->channel, chan, sizeof(struct lttng_channel));
54012638 168
03550b58 169 lkc->fd = -1;
54012638 170 lkc->stream_count = 0;
cbbbb275 171 lkc->event_count = 0;
d36b8583 172 lkc->enabled = 1;
e75cda3a 173 lkc->ctx = NULL;
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174 /* Init linked list */
175 CDS_INIT_LIST_HEAD(&lkc->events_list.head);
176 CDS_INIT_LIST_HEAD(&lkc->stream_list.head);
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177
178 return lkc;
179
180error:
181 return NULL;
182}
183
184/*
050349bb 185 * Allocate and initialize a kernel event. Set name and event type.
54012638 186 *
050349bb 187 * Return pointer to structure or NULL.
54012638 188 */
62499ad6 189struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev)
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190{
191 struct ltt_kernel_event *lke;
192 struct lttng_kernel_event *attr;
193
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194 lke = zmalloc(sizeof(struct ltt_kernel_event));
195 attr = zmalloc(sizeof(struct lttng_kernel_event));
54012638 196 if (lke == NULL || attr == NULL) {
df0f840b 197 PERROR("kernel event zmalloc");
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198 goto error;
199 }
200
f3ed775e 201 switch (ev->type) {
7d29a247 202 case LTTNG_EVENT_PROBE:
e6ddca71 203 attr->instrumentation = LTTNG_KERNEL_KPROBE;
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204 attr->u.kprobe.addr = ev->attr.probe.addr;
205 attr->u.kprobe.offset = ev->attr.probe.offset;
f3ed775e 206 strncpy(attr->u.kprobe.symbol_name,
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207 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
208 attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
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209 break;
210 case LTTNG_EVENT_FUNCTION:
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211 attr->instrumentation = LTTNG_KERNEL_KRETPROBE;
212 attr->u.kretprobe.addr = ev->attr.probe.addr;
213 attr->u.kretprobe.offset = ev->attr.probe.offset;
214 attr->u.kretprobe.offset = ev->attr.probe.offset;
215 strncpy(attr->u.kretprobe.symbol_name,
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216 ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
217 attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
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218 break;
219 case LTTNG_EVENT_FUNCTION_ENTRY:
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220 attr->instrumentation = LTTNG_KERNEL_FUNCTION;
221 strncpy(attr->u.ftrace.symbol_name,
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222 ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN);
223 attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 224 break;
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225 case LTTNG_EVENT_TRACEPOINT:
226 attr->instrumentation = LTTNG_KERNEL_TRACEPOINT;
f3ed775e 227 break;
a54bd42d
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228 case LTTNG_EVENT_SYSCALL:
229 attr->instrumentation = LTTNG_KERNEL_SYSCALL;
0133c199 230 break;
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231 case LTTNG_EVENT_ALL:
232 attr->instrumentation = LTTNG_KERNEL_ALL;
233 break;
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234 default:
235 ERR("Unknown kernel instrumentation type (%d)", ev->type);
236 goto error;
237 }
238
239 /* Copy event name */
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240 strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN);
241 attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0';
f3ed775e 242
54012638 243 /* Setting up a kernel event */
03550b58 244 lke->fd = -1;
54012638 245 lke->event = attr;
d36b8583 246 lke->enabled = 1;
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247
248 return lke;
249
250error:
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251 free(lke);
252 free(attr);
54012638
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253 return NULL;
254}
255
256/*
050349bb 257 * Allocate and initialize a kernel metadata.
54012638 258 *
050349bb 259 * Return pointer to structure or NULL.
54012638 260 */
a4b92340 261struct ltt_kernel_metadata *trace_kernel_create_metadata(void)
54012638 262{
54012638 263 struct ltt_kernel_metadata *lkm;
f3ed775e 264 struct lttng_channel *chan;
54012638 265
ba7f0ae5
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266 lkm = zmalloc(sizeof(struct ltt_kernel_metadata));
267 chan = zmalloc(sizeof(struct lttng_channel));
f3ed775e 268 if (lkm == NULL || chan == NULL) {
df0f840b 269 PERROR("kernel metadata zmalloc");
54012638
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270 goto error;
271 }
272
273 /* Set default attributes */
f3ed775e 274 chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
3e230f92 275 chan->attr.subbuf_size = default_get_metadata_subbuf_size();
b389abbe 276 chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
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277 chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
278 chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
7d452e12 279 chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
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280
281 /* Init metadata */
03550b58 282 lkm->fd = -1;
f3ed775e 283 lkm->conf = chan;
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284
285 return lkm;
286
287error:
a2c0da86
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288 free(lkm);
289 free(chan);
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290 return NULL;
291}
292
293/*
050349bb
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294 * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by
295 * default.
54012638 296 *
050349bb 297 * Return pointer to structure or NULL.
54012638 298 */
00e2e675
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299struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
300 unsigned int count)
54012638 301{
00e2e675 302 int ret;
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303 struct ltt_kernel_stream *lks;
304
ba7f0ae5 305 lks = zmalloc(sizeof(struct ltt_kernel_stream));
54012638 306 if (lks == NULL) {
df0f840b 307 PERROR("kernel stream zmalloc");
54012638
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308 goto error;
309 }
310
00e2e675
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311 /* Set name */
312 ret = snprintf(lks->name, sizeof(lks->name), "%s_%d", name, count);
313 if (ret < 0) {
314 PERROR("snprintf stream name");
315 goto error;
316 }
317 lks->name[sizeof(lks->name) - 1] = '\0';
318
54012638 319 /* Init stream */
03550b58 320 lks->fd = -1;
54012638
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321 lks->state = 0;
322
323 return lks;
324
325error:
326 return NULL;
327}
c363b55d 328
050349bb
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329/*
330 * Cleanup kernel stream structure.
331 */
62499ad6 332void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream)
c363b55d 333{
33a2b854 334 DBG("[trace] Closing stream fd %d", stream->fd);
c363b55d 335 /* Close kernel fd */
03550b58 336 if (stream->fd >= 0) {
c617c0c6
MD
337 int ret;
338
03550b58
MD
339 ret = close(stream->fd);
340 if (ret) {
341 PERROR("close");
342 }
799e2c4f 343 }
c363b55d
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344 /* Remove from stream list */
345 cds_list_del(&stream->list);
f9815039 346
c363b55d
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347 free(stream);
348}
349
050349bb
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350/*
351 * Cleanup kernel event structure.
352 */
62499ad6 353void trace_kernel_destroy_event(struct ltt_kernel_event *event)
c363b55d 354{
87eb4ab8 355 if (event->fd >= 0) {
c617c0c6
MD
356 int ret;
357
87eb4ab8
MD
358 DBG("[trace] Closing event fd %d", event->fd);
359 /* Close kernel fd */
799e2c4f
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360 ret = close(event->fd);
361 if (ret) {
362 PERROR("close");
363 }
87eb4ab8
MD
364 } else {
365 DBG("[trace] Tearing down event (no associated fd)");
366 }
c363b55d
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367
368 /* Remove from event list */
369 cds_list_del(&event->list);
f9815039
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370
371 free(event->event);
c363b55d
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372 free(event);
373}
374
050349bb
DG
375/*
376 * Cleanup kernel channel structure.
377 */
62499ad6 378void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel)
c363b55d 379{
af9737e9
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380 struct ltt_kernel_stream *stream, *stmp;
381 struct ltt_kernel_event *event, *etmp;
799e2c4f 382 int ret;
c363b55d 383
33a2b854 384 DBG("[trace] Closing channel fd %d", channel->fd);
c363b55d 385 /* Close kernel fd */
03550b58
MD
386 if (channel->fd >= 0) {
387 ret = close(channel->fd);
388 if (ret) {
389 PERROR("close");
390 }
799e2c4f 391 }
c363b55d
DG
392
393 /* For each stream in the channel list */
af9737e9 394 cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) {
62499ad6 395 trace_kernel_destroy_stream(stream);
c363b55d
DG
396 }
397
398 /* For each event in the channel list */
af9737e9 399 cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) {
62499ad6 400 trace_kernel_destroy_event(event);
c363b55d
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401 }
402
403 /* Remove from channel list */
404 cds_list_del(&channel->list);
f9815039 405
f9815039
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406 free(channel->channel);
407 free(channel->ctx);
c363b55d
DG
408 free(channel);
409}
410
050349bb
DG
411/*
412 * Cleanup kernel metadata structure.
413 */
62499ad6 414void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata)
c363b55d 415{
33a2b854 416 DBG("[trace] Closing metadata fd %d", metadata->fd);
c363b55d 417 /* Close kernel fd */
03550b58 418 if (metadata->fd >= 0) {
c617c0c6
MD
419 int ret;
420
03550b58
MD
421 ret = close(metadata->fd);
422 if (ret) {
423 PERROR("close");
424 }
799e2c4f 425 }
c363b55d 426
f9815039 427 free(metadata->conf);
c363b55d
DG
428 free(metadata);
429}
430
050349bb 431/*
62499ad6 432 * Cleanup kernel session structure
050349bb 433 */
62499ad6 434void trace_kernel_destroy_session(struct ltt_kernel_session *session)
c363b55d 435{
af9737e9 436 struct ltt_kernel_channel *channel, *ctmp;
799e2c4f 437 int ret;
c363b55d 438
33a2b854 439 DBG("[trace] Closing session fd %d", session->fd);
c363b55d 440 /* Close kernel fds */
03550b58
MD
441 if (session->fd >= 0) {
442 ret = close(session->fd);
443 if (ret) {
444 PERROR("close");
445 }
799e2c4f 446 }
f9815039 447
03550b58 448 if (session->metadata_stream_fd >= 0) {
70dc1c34 449 DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd);
799e2c4f
MD
450 ret = close(session->metadata_stream_fd);
451 if (ret) {
452 PERROR("close");
453 }
70dc1c34 454 }
c363b55d 455
d36b8583 456 if (session->metadata != NULL) {
62499ad6 457 trace_kernel_destroy_metadata(session->metadata);
d36b8583 458 }
c363b55d 459
af9737e9 460 cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) {
62499ad6 461 trace_kernel_destroy_channel(channel);
c363b55d
DG
462 }
463
00e2e675
DG
464 /* Wipe consumer output object */
465 consumer_destroy_output(session->consumer);
466 consumer_destroy_output(session->tmp_consumer);
467
f9815039 468 free(session->trace_path);
c363b55d
DG
469 free(session);
470}
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